diff -ur orig/otr.cpp znc-otr-11560d6700bdc57241968ada2f44f99220ef0bf6/otr.cpp
--- orig/otr.cpp	2017-07-27 14:48:52.000000000 +0000
+++ znc-otr-11560d6700bdc57241968ada2f44f99220ef0bf6/otr.cpp	2018-09-07 04:03:44.221995315 +0000
@@ -120,9 +120,9 @@
 
     static CString Clr(Color eClr, const CString& sWhat) {
         if (eClr == Bold) {
-            return "\x02" + sWhat + "\x02";
+            return CString("\x02") + sWhat + "\x02";
         } else {
-            return "\x03" + eClr + sWhat + "\x03";
+            return CString("\x03") + (char)eClr + sWhat + "\x03";
         }
     }
 
Only in znc-otr-11560d6700bdc57241968ada2f44f99220ef0bf6/: otr.cpp~